Hi guys, Im rather useless at working on my Bonnie and when it was taken to a guy I found to work on it last Summer I noticed it had a rather cool growl under acceleration that id never heard before over the last 12 years of riding it but as it was the first time this guy had worked on it I wondered if it was running lean and sure enough the plugs were close to white which even I know isnt a good thing ( as can put a hole in the pistons ) so can some of you guys help me to please ? Id like to know how to put this right myself , Thanks Steve